Zac from Wired Customs LLC shows us that tricks we will need to rebuild our Flathead Fuel pumps.
Keep in mind that as far as I know there is currently not any US manufacturers still making Flathead Fuel pumps. Meaning all the current pumps on the market are imports and quality is all over the place.
Side note: If you do choose to go with a new Fuel Pump here are a few things you might want to know. New doesn’t always mean working right out of the box. Some of the newer pumps don’t have good check balls. The check ball is the part of the pump that regulates the fuel pressure to the carburetor. We have had reports from one of our admins that when he was working at Hagen Auto Parts, he had to test each pump that came into the shop. The same brand and model pump would vary wildly in pressure from box to box.
So, make sure to check the pressure and add a regulator if needed. We have reports of some newer pumps putting out upwards of 15 psi. right out of the box.
You’re going to need to keep that fuel pressure below 4 psi for 94’s and 3.5 for 97s.
The best thing to do if you must buy a new fuel pump, is to add a quality gauge and a good regulator between the pump and the carbs. I can’t stress this enough. Don’t cheap out. The pressure from the new pump might ware that cheap regulator down over time and you will start seeing your carbs flood the bowls. Then back to the auto parts store you go to start all over again. I recommend the Holly fuel regulators. They are a little pricier but you will buy one and never have to worry about it again.
Now that we have that out of the way. Check out Zac’s great video. He honestly makes it easy to rebuild your old one. Which if you think you have the skills is always the best option.
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